er777This largest twin-engine jet burns 17,300 lb (7.8 tons) of fuel per hour at a speed of 495 knots (916 kmh or Mach 0.839) while cruising at an altitude of 30000 feet (FL300) withStrategic use of composites and advanced alloys. Advanced alloys saved 1,450 kilograms (3,200 pounds) of structural weht on the 777. Selected for mechanical properties and for their